S7-PRO Maintenance Manual (Basic Version V2.1)
INTERNAL
2012-07-20
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Page 57 of 97
SD card identification fails
Check whether the voltage of
C514 on the main board
（
PCB
）
is 2.85 V
Check whether the voltage of R4
on the auxiliary board is 2.85 V
Repair the auxiliary board
No
Yes
Yes
Replace U7
Replace the FPC connecting the
main board PCB and auxiliary
board PCB
No
Check whether short circuit to
ground occurs in R10, R9, R12,
R13, and R8 on the auxiliary
PCB
Yes
Replace the SD card socket
No
